By this system, spring starts on March 1 and runs through until May 31.

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Spring will arrive on March 1 or March 20, depending on your preference of seasonal calendar

Why do the dates of spring change each year?

The other system is to use the astronomical seasons.

These refer to the position of Earth's orbit in relation to the sun taking into account equinoxes (when the length of the day is exactly the same as the length of the night) and solstices (the longest and shortest days of the year).

If you want to get technical, the astronomical calendar determines the seasons by when the Earth's rotational axis is at a 23.5 degree in relation to its orbit around the sun.

By this system spring starts on March 20 and runs through until June 21.

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